physical significance of block size and valid subnets
Hi,
I am asking this question from the context of subnets and subnetting.
I read an article that uses block size to determine the number of valid subnets. The idea is to first find the total number of subnets and then starting 0, find multiples of block size until this count happens to just reach 'total subnets possible' or a value less than it.
For example, The question was to find the number of valid subnets for 192.168.1.0/26. Clearly, the number of host bits borrowed are 2, so total subnets are 2^2 = 4. So far so good. Now the block size was calculated as (256-192) = 64. This is also correct. Then the valid subnets are 0,64,128,192.
In this example, the total number of subnets (=4) is same as the valid subnets computed (4 in number). So, it is safe to assume that in this case, there were no "invalid" subnets.
Now, do invalid subnets exist? If yes, then what causes them to get invalid?
I am asking this question from the context of subnets and subnetting.
I read an article that uses block size to determine the number of valid subnets. The idea is to first find the total number of subnets and then starting 0, find multiples of block size until this count happens to just reach 'total subnets possible' or a value less than it.
For example, The question was to find the number of valid subnets for 192.168.1.0/26. Clearly, the number of host bits borrowed are 2, so total subnets are 2^2 = 4. So far so good. Now the block size was calculated as (256-192) = 64. This is also correct. Then the valid subnets are 0,64,128,192.
In this example, the total number of subnets (=4) is same as the valid subnets computed (4 in number). So, it is safe to assume that in this case, there were no "invalid" subnets.
Now, do invalid subnets exist? If yes, then what causes them to get invalid?
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